doc: set algorithmautorefname
doc: set algorithmautorefname

This makes autoref print algorithm references as "Algorithm x"
rather than as "algorithm x".

Signed-off-by: Sven Verdoolaege <e5350bbed4977f5eb8ae1dc6abd9ae59d21ace75@kotnet.org>

PollyLabs/isl,inducer/isl-mirror,nicolasvasilache/isl,UBERTC/isl,tobig/isl,UBERTC/isl,Meinersbur/isl,inducer/isl-mirror,nicolasvasilache/isl,Meinersbur/isl,inducer/isl-mirror,UBERTC/isl,inducer/isl-mirror,UBERTC/isl,BenzoSM/isl,tobig/isl,tobig/isl,Meinersbur/isl,BenzoSM/isl,tobig/isl,PollyLabs/isl,BenzoSM/isl,PollyLabs/isl,inducer/isl-mirror,nicolasvasilache/isl,BenzoSM/isl,Meinersbur/isl,BenzoSM/isl,PollyLabs/isl,nicolasvasilache/isl,PollyLabs/isl,nicolasvasilache/isl